401591 has 4 divisors (see below), whose sum is σ = 425232. Its totient is φ = 377952.

The previous prime is 401587. The next prime is 401593. The reversal of 401591 is 195104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401591 - 2² = 401587 is a prime.

It is a super-2 number, since 2×401591² = 322550662562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11795 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (106308).

2⁴⁰¹⁵⁹¹ is an apocalyptic number.

401591 is a deficient number, since it is larger than the sum of its proper divisors (23641).

401591 is a wasteful number, since it uses less digits than its factorization.

401591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23640.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 401591 is about 633.7120797334. The cubic root of 401591 is about 73.7781889752.

Adding to 401591 its reverse (195104), we get a palindrome (596695).

The spelling of 401591 in words is "four hundred one thousand, five hundred ninety-one".